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SN 2020bqj: a Type Ibn supernova with a long lasting peak plateau
- Source :
- Astron.Astrophys., Astron.Astrophys., 2021, 652, pp.A136. ⟨10.1051/0004-6361/202039137⟩
- Publication Year :
- 2020
- Publisher :
- arXiv, 2020.
-
Abstract
- Context: Type Ibn supernovae are a rare class of stripped envelope supernovae interacting with a helium-rich CSM. The majority of the SNe Ibn reported display a surprising homogeneity in their fast lightcurves and starforming hosts. Aims: We present the discovery and study of SN 2020bqj (ZTF20aalrqbu), a SN Ibn with a long-duration peak plateau lasting 40 days and hosted by a faint low-mass galaxy. We aim to explain its peculiar properties using an extensive data set. Methods: We compare the evolution of SN 2020bqj with SNe Ibn from the literature. We fit the bolometric and multi-band lightcurves with different powering mechanism models. Results: The risetime, peak magnitude and spectral features of SN 2020bqj are consistent with those of most SNe Ibn, but the SN is a clear outlier based on its bright, long-lasting peak plateau and low host mass. We show through modeling that the lightcurve can be powered predominantly by shock heating from the interaction of the SN ejecta and a dense CSM. The peculiar Type Ibn SN 2011hw is a close analog to SN 2020bqj, suggesting a similar progenitor and CSM scenario. In this scenario a very massive progenitor star in the transitional phase between a luminous blue variable and a compact Wolf-Rayet star undergoes core-collapse, embedded in a dense helium-rich CSM with an elevated opacity compared to normal SNe Ibn, due to the presence of residual hydrogen. This scenario is consistent with the observed properties of SN 2020bqj and the modeling results. Conclusions: SN 2020bqj is a compelling example of a transitional SN Ibn/IIn based on not only its spectral features, but also its lightcurve, host galaxy properties and the inferred progenitor properties. The strong similarity with SN 2011hw suggests this subclass may be the result of a progenitor in a stellar evolution phase that is distinct from those of progenitors of regular SNe Ibn.<br />Comment: 22 pages, 14 figures, 5 tables. Accepted for publication in Astronomy & Astrophysics. Abstract abridged for arXiv submission
- Subjects :
- Opacity
individual: SN 2011hw [supernovae]
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences
Context (language use)
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astronomy & Astrophysics
01 natural sciences
0103 physical sciences
Astrophysics::Solar and Stellar Astrophysics
Ejecta
010303 astronomy & astrophysics
Stellar evolution
Astrophysics::Galaxy Astrophysics
QB
Physics
individual: SN 2020bqj [supernovae]
High Energy Astrophysical Phenomena (astro-ph.HE)
010308 nuclear & particles physics
Astronomy and Astrophysics
Galaxy
Supernova
Luminous blue variable
13. Climate action
Space and Planetary Science
Magnitude (astronomy)
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Astrophysics - High Energy Astrophysical Phenomena
general [supernovae]
Astronomical and Space Sciences
Subjects
Details
- ISSN :
- 14320746
- Database :
- OpenAIRE
- Journal :
- Astron.Astrophys., Astron.Astrophys., 2021, 652, pp.A136. ⟨10.1051/0004-6361/202039137⟩
- Accession number :
- edsair.doi.dedup.....334bcfa3a3c4246792f2294fba596058
- Full Text :
- https://doi.org/10.48550/arxiv.2008.04056